<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <select v-model="www">
            <option value="1">选择1</option>
            <option value="2">选择2</option>
            <option value="3">选择3</option>
            <option value="4">选择4</option>
        </select>
    </div>
</body>
<script src="./vue.js"></script>
<script>
    const { createApp, ref } = Vue;

    createApp({
        setup() {
            const www = ref('1');

            return { www };
        }
    }).mount('#app');
</script>
</html>
